| Function | Description |
|---|
| basename() | Returns the filename component of a path |
| chgrp() | Changes the file group |
| chmod() | Changes the file mode |
| chown() | Changes the file owner |
| clearstatcache() | Clears the file status cache |
| copy() | Copies a file |
| delete() | See unlink() |
| dirname() | Returns the directory name component of a path |
| disk_free_space() | Returns the free space of a filesystem or disk |
| disk_total_space() | Returns the total size of a filesystem or disk |
| diskfreespace() | Alias of disk_free_space() |
| fclose() | Closes an open file |
| feof() | Checks if the “end-of-file” (EOF) has been reached for an open file |
| fflush() | Flushes buffered output to an open file |
| fgetc() | Returns a single character from an open file |
| fgetcsv() | Returns a line from an open CSV file |
| fgets() | Returns a line from an open file |
| fgetss() | Deprecated from PHP 7.3. Returns a line from an open file – stripped from HTML and PHP tags |
| file() | Reads a file into an array |
| file_exists() | Checks whether or not a file or directory exists |
| file_get_contents() | Reads a file into a string |
| file_put_contents() | Writes data to a file |
| fileatime() | Returns the last access time of a file |
| filectime() | Returns the last change time of a file |
| filegroup() | Returns the group ID of a file |
| fileinode() | Returns the inode number of a file |
| filemtime() | Returns the last modification time of a file |
| fileowner() | Returns the user ID (owner) of a file |
| fileperms() | Returns the file’s permissions |
| filesize() | Returns the file size |
| filetype() | Returns the file type |
| flock() | Locks or releases a file |
| fnmatch() | Matches a filename or string against a specified pattern |
| fopen() | Opens a file or URL |
| fpassthru() | Reads from the current position in a file – until EOF, and writes the result to the output buffer |
| fputcsv() | Formats a line as CSV and writes it to an open file |
| fputs() | Alias of fwrite() |
| fread() | Reads from an open file (binary-safe) |
| fscanf() | Parses input from an open file according to a specified format |
| fseek() | Seeks in an open file |
| fstat() | Returns information about an open file |
| ftell() | Returns the current position in an open file |
| ftruncate() | Truncates an open file to a specified length |
| fwrite() | Writes to an open file (binary-safe) |
| glob() | Returns an array of filenames / directories matching a specified pattern |
| is_dir() | Checks whether a file is a directory |
| is_executable() | Checks whether a file is executable |
| is_file() | Checks whether a file is a regular file |
| is_link() | Checks whether a file is a link |
| is_readable() | Checks whether a file is readable |
| is_uploaded_file() | Checks whether a file was uploaded via HTTP POST |
| is_writable() | Checks whether a file is writable |
| is_writeable() | Alias of is_writable() |
| lchgrp() | Changes the group ownership of a symbolic link |
| lchown() | Changes the user ownership of a symbolic link |
| link() | Creates a hard link |
| linkinfo() | Returns information about a hard link |
| lstat() | Returns information about a file or symbolic link |
| mkdir() | Creates a directory |
| move_uploaded_file() | Moves an uploaded file to a new location |
| parse_ini_file() | Parses a configuration file |
| parse_ini_string() | Parses a configuration string |
| pathinfo() | Returns information about a file path |
| pclose() | Closes a pipe opened by popen() |
| popen() | Opens a pipe |
| readfile() | Reads a file and writes it to the output buffer |
| readlink() | Returns the target of a symbolic link |
| realpath() | Returns the absolute pathname |
| realpath_cache_get() | Returns realpath cache entries |
| realpath_cache_size() | Returns realpath cache size |
| rename() | Renames a file or directory |
| rewind() | Rewinds a file pointer |
| rmdir() | Removes an empty directory |
| set_file_buffer() | Alias of stream_set_write_buffer(). Sets the buffer size for write operations on the given file |
| stat() | Returns information about a file |
| symlink() | Creates a symbolic link |
| tempnam() | Creates a unique temporary file |
| tmpfile() | Creates a unique temporary file |
| touch() | Sets access and modification time of a file |
| umask() | Changes file permissions for files |
| unlink() | Deletes a file |
